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14 April, 17:00

An electron moving at4.00 * 103m/sin a 1.25-Tmagnetic field experiences a magnetic force of1.40 * 10-16N. What angle does the velocity of theelectron make with the magnetic field? There are twoanswers

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  1. 14 April, 17:29
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    velocity of electron V = 4 x 10³ m/s

    magnetic field B = 1.25 T.

    magnetic force = 1.4 x 10⁻¹⁶ N.

    If direction of velocity makes angle θ with magnetic field

    magnetic force = magnetic field x charge on electron x velocity x sinθ

    1.4 x 10⁻¹⁶ = 1.25 x 1.6 x 10⁻¹⁹ x 4 x 10³ x sinθ

    1.4 x 10⁻¹⁶ = 8 x 10⁻¹⁶ x sinθ

    sinθ = 1.4 / 8

    =.175

    θ = 10 degree

    or 180 - 10

    = 170 degree

    because

    sinθ = sin (180 - θ)
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